Proofing tray



FIG. 1 is a view in perspective of a proofing tray showing my new design;

FIG. 2 is a view in top plan;

FIG. 3 is a view in side elevation, the other side being a mirror image thereof;

FIG. 4 is a view in bottom plan;

FIG. 5 is a view in end elevation, the other end being a mirror image thereof; and

FIG. 6 is a transverse sectional view taken through line 6--6 of FIG. 2. 

The ornamental design for proofing tray, as shown and described. 